/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

import MyBean.Connessione;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author dav
 */
public class cPrenotazioni extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    Connessione con = new Connessione();    
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException, SQLException {
        response.setContentType("text/html;charset=UTF-8");
        char action = request.getParameter("action").toCharArray()[0];
        switch(action){
            case 'p':prenotaLibro(request,response);break;
            case 'v':visualizzaPreno(request,response);break;
            case 'a':annullaPreno(request,response);break;
            case 'm':annullaMulti(request,response);break;

        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (SQLException ex) {
            Logger.getLogger(cPrenotazioni.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (SQLException ex) {
            Logger.getLogger(cPrenotazioni.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

    private void prenotaLibro(HttpServletRequest request, HttpServletResponse response) throws IOException, SQLException, ServletException {
        PrintWriter out = response.getWriter();
        HttpSession s = request.getSession();
        String titolo = request.getParameter("titolo");
        String autore = request.getParameter("autore");
        String editore = request.getParameter("editore");
        String anno = request.getParameter("anno");
        int annno=Integer.valueOf(anno).intValue();
        java.sql.Statement st = con.getConn();
        
        try {
            ResultSet r = st.executeQuery("SELECT * FROM prenotati WHERE Titolo='"+titolo+"' AND Autore = '"+autore+"' AND Editore = '"+editore+"' AND Anno ="+annno);
            if(r.next()){
                request.setAttribute("LibroPrenotato","1");
                request.setAttribute("titolo",titolo);
                request.setAttribute("autore",autore);
                request.setAttribute("editore",editore);
                request.setAttribute("anno",anno);

                RequestDispatcher rd = request.getRequestDispatcher(response.encodeURL("/prenota.jsp")); 
                rd.forward(request, response);
            }else{
                st.executeUpdate("INSERT INTO prenotati values('"+titolo+"','"+autore+"','"+editore+"',"+annno+",'"+s.getAttribute("username")+"')");
                RequestDispatcher rd = request.getRequestDispatcher(response.encodeURL("/prenotazioni.jsp")); 
                rd.forward(request, response);
            }
        } finally {            
            out.close();
        }
        
    }

    private void visualizzaPreno(HttpServletRequest request, HttpServletResponse response) throws IOException, SQLException {
        PrintWriter out = response.getWriter();
        HttpSession s = request.getSession();
        java.sql.Statement st = con.getConn();

    try {
        int n=0;
        ResultSet rss = st.executeQuery("SELECT * FROM prenotati WHERE Username='"+s.getAttribute("username")+"'");
        while(rss.next()){
            n++;
        }
        ResultSet rs = st.executeQuery("SELECT * FROM prenotati WHERE Username ='"+s.getAttribute("username")+"'");
        int i=0;
        if(n>0){
        out.print("<form action=\"cPrenotazioni?action=m\" method=\"post\">");

        out.print("<table id=\"res_table2\"><th><input type=\"Submit\" value=\"Annulla selezionati\"></th>");
        while(rs.next()){
                if(i%2==0){
                    out.print("<tr class=\"scuro\">");
                }
                else{
                    out.print("<tr class=\"chiaro\">");
                }    
            out.println("<td><input type=\"checkbox\" name=\""+i+"\" value=\""+rs.getString("Titolo")+","+rs.getString("Autore")+","+rs.getString("Editore")+","+rs.getString("Anno")+"\"></td></tr>");
            i++;
        
        }
        out.print("<input type=\"hidden\" name=\"valore\" value=\""+(i-1)+"\"/>");
        out.print("</table>");
        out.print("");
        out.print("</form>");
        
        
        out.print("<table id=\"res_table3\"><th>Titolo</th><th>Autore</th><th>Editore</th><th>Anno</th><th>Annulla</th>");
        i=0;
        rs=st.executeQuery("SELECT * FROM prenotati WHERE Username ='"+s.getAttribute("username")+"'");
        
        while(rs.next()){
                if(i%2==0){
                    out.print("<tr class=\"scuro\"><td>");
                }
                else{
                    out.print("<tr class=\"chiaro\"><td>");
                }
                        out.println(rs.getString("Titolo"));
                        out.println("</td><td>");
                        
                        out.println(rs.getString("Autore"));
                        out.println("</td><td>");

                        out.println(rs.getString("Editore"));
                        out.println("</td><td>");

                        out.println(rs.getString("Anno"));
                        out.println("</td><td><form action=\"cPrenotazioni?action=a\" method=\"POST\">"
                                + "<input type=\"hidden\" name=\"titololibro\" value=\""
                                + rs.getString("Titolo")
                                + "\">"
                                + "<input type=\"hidden\" name=\"autorelibro\" value=\""
                                + rs.getString("Autore")
                                + "\">"
                                + "<input type=\"hidden\" name=\"editorelibro\" value=\""
                                + rs.getString("Editore")
                                + "\">"
                                + "<input type=\"hidden\" name=\"annolibro\" value=\""
                                + rs.getString("Anno")
                                + "\">"
                                + "<input type=\"submit\" value=\"Annulla\">");
                        out.println("</form></td></tr>");
                        
                        i++;
                    }
        
        out.println("</table>");
        }else{
            out.print("<center><h2>Non hai prenotazioni</h2></center>");
        }
    
    } finally {            
            out.close();
        }    
    }

    private void annullaPreno(HttpServletRequest request, HttpServletResponse response) throws IOException, SQLException, ServletException {
            PrintWriter out = response.getWriter();
        HttpSession s = request.getSession();
        String titolo = request.getParameter("titololibro");
        String autore = request.getParameter("autorelibro");
        String editore = request.getParameter("editorelibro");
        String anno = request.getParameter("annolibro");
        int annno=Integer.valueOf(anno).intValue();
        java.sql.Statement st = con.getConn();
        
        try {
            int r = 
                st.executeUpdate("DELETE FROM prenotati WHERE titolo='"+titolo+"' and autore='"+autore+"' and editore = '"+editore+"' and anno= "+annno+" and username = '"+s.getAttribute("username")+"'");
            out.print("<script type=\"text/javascript\"> alert(\"Prenotazione annullata  con successo\"); window.location.href=\"prenotazioni.jsp\"</script>");           
            
        } finally {            
            out.close();
        }    
    }

    private void annullaMulti(HttpServletRequest request, HttpServletResponse response) throws IOException, SQLException {
        PrintWriter out = response.getWriter();
        HttpSession s = request.getSession();
        String ai = request.getParameter("valore");
        int i=Integer.valueOf(ai).intValue();   
        java.sql.Statement st = con.getConn();
        while(i>=0){
            //analizzare
            ai=Integer.toString(i);
            String asd = request.getParameter(ai);
            if(!"".equals(asd)){
                //tette
                String[] vals=asd.split(",");
                int annno=Integer.valueOf(vals[3]).intValue();
            int r = 
                st.executeUpdate("DELETE FROM prenotati WHERE titolo='"+vals[0]+"' and autore='"+vals[1]+"' and editore = '"+vals[2]+"' and anno= "+annno+" and username = '"+s.getAttribute("username")+"'");
            out.print("<script type=\"text/javascript\"> alert(\"Prenotazioni annullate  con successo\"); window.location.href=\"prenotazioni.jsp\"</script>");           
           }
            //splittare e cancellare
            i--;    
        }
        out.close();
    }
}
